Strafe is a Justice deck exclusive effect card. As of Beta 13.1, it deals 2 damage to all enemies, acting like an upgraded version of Shootout. It also works like a weaker, all enemy version of Punishment, much like Perseverance's Worsening and Pollutant Gas, but able to damage the enemy.
The effect can be used with Asgore, kill all enemy monsters just for 17 gold, it can also be used with Papyrus or other Charge monsters to kill the monsters that didn't die. This is also good with Undyne or Undyne's Spears to kill out the remaining monsters.